obsidian-mcp-pro

Instructions

Implementation Reference

• src/tools/links.ts:103-212 (handler)

  The implementation of the get_backlinks tool handler. It builds a link graph of the vault, resolves the target note path, retrieves backlinks from the graph, and formats the output showing the source notes and context lines.

  // ── get_backlinks ──────────────────────────────────────────────
  server.registerTool(
    "get_backlinks",
    {
      description: "Find all notes that link to a specific note",
      inputSchema: {
        path: z.string().min(1).describe("The target note path (relative to vault root)"),
      },
    },
    async ({ path: targetPath }) => {
      try {
        const graph = await buildLinkGraph(vaultPath);
  
        // Normalize target for comparison
        const targetNormalized = targetPath.replace(/\.md$/i, "").toLowerCase();
        const targetBasename = targetNormalized.split("/").pop() ?? targetNormalized;
  
        // Find the actual note path that matches the target
        let resolvedTarget: string | null = null;
        for (const notePath of graph.allNotes) {
          const noteNormalized = notePath.replace(/\.md$/i, "").toLowerCase();
          if (noteNormalized === targetNormalized) {
            resolvedTarget = notePath;
            break;
          }
        }
  
        // Also try basename matching if exact match failed
        if (!resolvedTarget) {
          for (const notePath of graph.allNotes) {
            const noteBasename = notePath
              .replace(/\.md$/i, "")
              .split("/")
              .pop()
              ?.toLowerCase();
            if (noteBasename === targetBasename) {
              resolvedTarget = notePath;
              break;
            }
          }
        }
  
        if (!resolvedTarget) {
          return errorResult(`No note found matching path: ${targetPath}`);
        }
  
        const backlinkSources = graph.backlinks.get(resolvedTarget);
        if (!backlinkSources || backlinkSources.size === 0) {
          return {
            content: [
              {
                type: "text" as const,
                text: `No backlinks found for: ${resolvedTarget}`,
              },
            ],
          };
        }
  
        const results: { source: string; line: number; context: string }[] = [];
  
        for (const sourcePath of backlinkSources) {
          const lines = graph.noteLines.get(sourcePath) ?? [];
          // Find the line(s) that contain the link to the target
          const links = graph.rawLinks.get(sourcePath) ?? [];
          const relevantLinks = links.filter((l) => {
            const base = l.target.split("#")[0].trim();
            const resolved = resolveWikilink(base, sourcePath, graph.allNotes);
            return resolved === resolvedTarget;
          });
  
          if (relevantLinks.length > 0) {
            for (const link of relevantLinks) {
              const lineInfo = findLineWithLink(lines, link.target);
              results.push({
                source: sourcePath,
                line: lineInfo.line,
                context: lineInfo.content,
              });
            }
          } else {
            results.push({ source: sourcePath, line: 0, context: "" });
          }
        }
  
        // Deduplicate by source+line
        const seen = new Set<string>();
        const deduped = results.filter((r) => {
          const key = `${r.source}:${r.line}`;
          if (seen.has(key)) return false;
          seen.add(key);
          return true;
        });
  
        const output = [
          `Backlinks to: ${resolvedTarget}`,
          `Found: ${deduped.length} backlink(s)\n`,
          ...deduped.map((r) => {
            const lineStr = r.line > 0 ? `:${r.line}` : "";
            const contextStr = r.context ? `  → ${r.context}` : "";
            return `- ${r.source}${lineStr}${contextStr}`;
          }),
        ].join("\n");
  
        return { content: [{ type: "text" as const, text: output }] };
      } catch (err) {
        console.error("get_backlinks error:", err);
        return errorResult(`Error finding backlinks: ${err instanceof Error ? err.message : String(err)}`);
      }
    },
  );